Power transmission system receiving end fault processing method and device, electronic equipment and storage medium

Abstract

The invention discloses a power transmission system receiving end fault processing method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining an operation state parameter set of a receiving end converter station; determining a fault level according to the operation state parameter set; obtaining a control instruction set according to the fault level; and executing the control instruction set. According to the method, different types of faults can be accurately identified and classified, detailed fault processing logic is preset for different fault types, the effects of high fault diagnosis accuracy, high adaptability and excellent fault processing effect are achieved, and the stability of system operation is improved.

Description

Technical Field

[0001] This invention belongs to the field of DC power transmission technology, specifically relating to a method, device, electronic equipment, and storage medium for handling faults at the receiving end of a power transmission system. Background Technology

[0002] Ultra-high voltage direct current (UHVDC) transmission systems, as a key technology in modern power transmission, play an irreplaceable role in realizing cross-regional, large-capacity power transmission. A typical UHVDC transmission system topology includes sending-end and receiving-end converter stations interconnected by DC lines. Fault handling at the receiving-end converter station directly affects the transient stability and equipment safety of the entire system. When a fault occurs at the receiving end, failure to accurately identify the fault level and implement adaptive control strategies will lead to the following serious consequences: interruption of DC power transmission causing DC overvoltage; fault propagation triggering cascading blockage reactions; and unnecessary bypass switch operations leading to equipment lifespan loss.

[0003] Existing technologies generally employ fault handling mechanisms based on a single protection action signal, which suffer from the following technical bottlenecks: ① Adaptability defects in abnormal communication conditions: When inter-station communication is interrupted, existing technologies have a high risk of misjudgment, leading to: the failure of the required coordinated blocking strategy and an increase in the maloperation rate of bypass switches; ② Voltage operation mode mismatch: Traditional methods do not distinguish between full-voltage and half-voltage operation modes (e.g., the fault current in half-voltage mode is only 41% of that in full-voltage mode), resulting in: the use of a half-voltage control strategy in full-voltage mode causing overvoltage risk, and the continued use of a full-voltage strategy in half-voltage mode causing power oscillation. In particular, some existing solutions use a single-dimensional judgment standard based on protection action signals, failing to establish a dynamic combination analysis mechanism for the set of operating status parameters. Fault classification does not consider the coupling relationship between communication status and protection levels (e.g., it does not distinguish between the coordinated strategies of pole blocking and valve blocking), the control strategy lacks a hierarchical response logic that adapts to voltage operation modes, and the lack of a time delay feature database results in a lack of data support for operation sequence optimization.

[0004] The aforementioned defects lead to the following contradictions in the practical application of existing technologies: expanding the blocking range to shorten fault clearing time actually increases power loss; adopting a conservative strategy to avoid system oscillation prolongs the fault duration; and using the same control parameters for different voltage modes exacerbates equipment stress. Summary of the Invention

[0005] The purpose of this invention is to address three major technical bottlenecks in receiving-end fault handling of ultra-high voltage direct current (UHVDC) transmission systems: mismatch between protection actions and inter-station coordination under abnormal communication conditions, lack of adaptability between voltage operation modes and control strategies, and conflict between multi-objective optimization of fault clearing speed and system stability. This invention provides a method, device, electronic equipment, and storage medium for receiving-end fault handling in transmission systems. It can accurately identify and classify different types of faults and pre-set detailed fault handling logic for different fault types, achieving high accuracy in fault diagnosis, strong adaptability, and excellent fault handling effect, thereby improving the stability of system operation.

[0006] To achieve the above objectives, the solution of the present invention is:

[0007] A method for handling receiving-end faults in a power transmission system, comprising:

[0008] Obtain the set of operating status parameters for the receiving-end converter station;

[0009] The fault level is determined based on the set of operating status parameters;

[0010] The control instruction set is obtained based on the fault level;

[0011] Execute the set of control instructions.

[0012] The acquisition of the operating status parameter set of the receiving-end converter station includes the acquisition of inter-station communication status, pole-locking protection action signals, valve-locking protection action signals, and voltage operation mode parameters. The voltage operation mode parameters include full-voltage operation mode and half-voltage operation mode.

[0013] The voltage operation mode parameters include full-voltage operation mode and half-voltage operation mode, including:

[0014] When the DC line voltage is maintained at 95%-105% of the rated value, it is considered to be in full-voltage operation mode;

[0015] When the DC line voltage is maintained at 45%-55% of the rated value, it is considered to be in half-voltage operation mode.

[0016] Among them, determining the fault level based on the set of operating status parameters includes,

[0017] When there is abnormal inter-station communication, or when there is a signal of protection action of pole interlock or valve interlock, it is judged as a first-level fault;

[0018] When inter-station communication is normal and only the polar blocking type protection action signal exists, it is judged as a level two fault;

[0019] When inter-station communication is normal, only valve lockout protection action signals exist, and the system is operating in full-pressure mode, it is determined to be a Class A Level 3 fault.

[0020] When inter-station communication is normal, only valve lockout protection action signals exist, and the system is operating in semi-pressure mode, it is determined to be a Class B Level 3 fault.

[0021] The control instruction set, derived based on the fault level, includes:

[0022] The control instruction set includes fault component blocking strategy, bypass switch operation strategy, and coordinated response strategy of sending-end converter station.

[0023] The coordinated response strategy of the sending-end converter station includes,

[0024] The sending-end converter station dynamically adjusts at least one of the following based on the receiving-end fault level: DC voltage reference value, power transmission rate, frequency modulation depth, and reactive power compensation amount.

[0025] Executing the control instruction set includes,

[0026] When the control instruction set contains multiple feasible operation sequences, the operation sequence to be executed is determined based on the principles of shortest fault clearing time, maximum transmission capacity, and priority of system oscillation suppression.

[0027] The operation sequence is determined based on the principle of minimizing fault clearing time, including:

[0028] Construct a database of control command execution delays to record the delay characteristics of each operation combination;

[0029] For multiple feasible operation sequences, the sequence with a total delay less than a preset threshold is selected as the operation sequence.

[0030] A receiving-end fault handling device for a power transmission system, comprising,

[0031] The operating status parameter set monitoring module is configured to acquire the operating status parameter set of the receiving-end converter station;

[0032] The fault level determination module is configured to determine the fault level based on the set of operating status parameters;

[0033] The control instruction set generation module is configured to generate a control instruction set based on the fault level; and,

[0034] The control instruction set execution module is configured to execute the control instruction set.

[0035] The operating status parameter set monitoring module acquires the operating status parameter set of the receiving-end converter station, including the inter-station communication status, pole interlocking protection action signals, valve interlocking protection action signals, and voltage operating mode parameters. The voltage operating mode parameters include full-voltage operating mode and half-voltage operating mode.

[0036] The voltage operation mode parameters include full-voltage operation mode and half-voltage operation mode, including:

[0037] When the DC line voltage is maintained at 95%-105% of the rated value, it is considered to be in full-voltage operation mode;

[0038] When the DC line voltage is maintained at 45%-55% of the rated value, it is considered to be in half-voltage operation mode.

[0039] The fault level determination module determines the fault level based on the set of operating status parameters, including:

[0040] When there is abnormal inter-station communication, or when there is a signal of protection action of pole interlock or valve interlock, it is judged as a first-level fault;

[0041] When inter-station communication is normal and only the polar blocking type protection action signal exists, it is judged as a level two fault;

[0042] When inter-station communication is normal, only valve lockout protection action signals exist, and the system is operating in full-pressure mode, it is determined to be a Class A Level 3 fault.

[0043] When inter-station communication is normal, only valve lockout protection action signals exist, and the system is operating in semi-pressure mode, it is determined to be a Class B Level 3 fault.

[0044] The control instruction set generation module generates a control instruction set based on the fault level, including:

[0045] The control instruction set includes fault component blocking strategy, bypass switch operation strategy, and coordinated response strategy of sending-end converter station.

[0046] The coordinated response strategy of the sending-end converter station includes,

[0047] The sending-end converter station dynamically adjusts at least one of the following based on the receiving-end fault level: DC voltage reference value, power transmission rate, frequency modulation depth, and reactive power compensation amount.

[0048] The control instruction set execution module executes the control instruction set, including...

[0049] When the control instruction set contains multiple feasible operation sequences, the operation sequence to be executed is determined based on the principles of shortest fault clearing time, maximum transmission capacity, and priority of system oscillation suppression.

[0050] The operation sequence is determined based on the principle of minimizing fault clearing time, including:

[0051] Construct a database of control command execution delays to record the delay characteristics of each operation combination;

[0052] For multiple feasible operation sequences, the sequence with a total delay less than a preset threshold is selected as the operation sequence.

[0053] An electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor; when the processor executes the computer program, it implements the steps of the power transmission system receiving-end fault handling method as described above.

[0054] A computer-readable storage medium storing a computer program; when executed by a processor, the computer program implements the steps of the power transmission system receiving-end fault handling method as described above.

[0055] By adopting the above scheme, this invention provides a power transmission system receiving-end fault handling scheme based on dynamic state fusion and hierarchical strategy adaptation, specifically achieving the following technical breakthroughs:

[0056] ①This invention establishes a dynamic fusion analysis mechanism for a multi-dimensional set of operating status parameters, which solves the problem of misjudgment due to the coupling between communication status and protection action signals, and significantly improves the accuracy of fault determination;

[0057] ②This invention constructs a three-level fault determination architecture that includes voltage operation modes, realizes the generation of differentiated control strategies under full-voltage / half-voltage modes, and can accurately identify and classify different types of faults;

[0058] ③ This invention develops a time delay feature-driven operation sequence optimization algorithm, which achieves multi-objective coordination of maximizing transmission capacity and suppressing system oscillation under the constraint of fault clearing time ≤ 80ms, thereby reducing fault clearing time.

[0059] ④ This invention reduces transient stress on converter valves, decreases BPS operation frequency, and extends equipment life by accurately identifying fault levels and implementing appropriate control strategies.

[0060] ⑤ This invention provides a method for handling faults at the receiving end of a power transmission system, and simultaneously provides devices, electronic devices, and storage media for implementing the method, forming a technical solution system covering the entire chain of fault handling at the receiving end of UHVDC power transmission. Attached Figure Description

[0061] Figure 1 This is a schematic diagram of the DC power transmission system used in this invention;

[0062] Figure 2 This is a schematic diagram of the overall process of the power transmission system receiving end fault handling method according to an embodiment of the present invention;

[0063] Figure 3 This is a schematic diagram of the structure of the power transmission system receiving-end fault handling device according to an embodiment of the present invention;

[0064] Figure 4 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention;

[0065] Figure label:

[0066] 10 - Sending-end power grid; 20 - Sending-end converter station; 30 - DC line; 40 - Receiving-end converter station; 50 - Receiving-end power grid; 301 - Operating status parameter set monitoring module; 302 - Fault level determination module; 303 - Control command set generation module; 304 - Control command set execution module. Detailed Implementation

[0067] Please see Figure 1 , Figure 1 The diagram illustrates the structure of a DC power transmission system used in an embodiment of the present invention. The DC power transmission system includes a sending-end power grid 10, a sending-end converter station 20, a DC line 30, a receiving-end converter station 40, and a receiving-end power grid 50 connected in sequence. The sending-end power grid 10 may include power generation facilities of fossil fuel power plants and new energy power plants. The sending-end power grid 10 may include one or more AC power grids of the same or different voltage levels. The AC power generated by the sending-end power grid 10 is rectified into DC power by the sending-end converter station 20. The DC power is transmitted to the receiving-end converter station 40 via the DC line 30 between the sending-end converter station 20 and the receiving-end converter station 40. The receiving-end converter station 40 inverts the received DC power into AC power and transmits it to the receiving-end power grid 50. Both the sending-end converter station 20 and the receiving-end converter station 40 include two poles. Each pole is formed by a high-end converter valve group and a low-end converter valve group connected in series. Each converter valve group is connected in parallel with a valve group bypass switch (BPS). In some examples, the sending-end converter station 20 can be an LCC type converter valve or an MMC type converter valve. The receiving-end converter station 40 can be an LCC type converter valve or an MMC type converter valve.

[0068] During long-distance DC power transmission via a DC transmission system, a fault at the receiving-end converter station 40 restricts DC power transmission. The excess power causes the system voltage to exceed safety limits within a short period, endangering the safety of equipment such as converter valves. Quickly and accurately identifying the fault type and taking effective measures is crucial to ensuring stable system operation.

[0069] Existing technologies identify fault locations based on protection action results, then perform necessary converter valve interlocking and bypass switch (BPS) closing operations to isolate faults and protect equipment such as converter valves. However, UHVDC transmission systems have complex topologies and diverse operating modes, requiring different handling strategies for different types of faults. Existing technologies struggle to comprehensively cover all possible fault scenarios, especially different fault types occurring under communication anomalies or full / half-voltage operation modes. Due to the lack of a detailed fault classification mechanism, unnecessary bypass switch (BPS) operations or unnecessary interlocking may be executed, affecting the effectiveness of fault handling. Therefore, this invention provides a fault handling method for the receiving end of a transmission system, applied to UHVDC transmission systems. When a fault occurs at the receiving-end converter station 40, the fault is classified into four categories based on inter-station communication status, pole interlocking protection actions, valve interlocking protection actions, and full / half-voltage operation status. For each type of fault, fault handling operations such as pole / valve interlocking and BPS closing / disclosing are performed to address the shortcomings of the aforementioned technologies.

[0070] Please see Figure 2 , Figure 2 The overall flow of the power transmission system receiving-end fault handling method according to an embodiment of the present invention is illustrated. The power transmission system receiving-end fault handling method includes the following steps:

[0071] Step 201: Monitor the operating status parameter set of the receiving-end converter station 40 in real time. The parameter set includes: inter-station communication status, pole interlocking protection action signals, valve interlocking protection action signals, and voltage operation mode parameters.

[0072] The fault types of the receiving-end converter station 40 can be divided into two types: valve area faults and pole area faults. Valve area faults can be metallic or non-metallic single-phase ground faults, two-phase short-circuit faults, two-phase short-circuit ground faults, and three-phase short-circuit faults. Pole area faults can be pole ground faults, valve group connection line ground faults, high valve short-circuit faults, low valve short-circuit faults, neutral bus ground faults, and pole bus to neutral short-circuit faults.

[0073] Among them, pole-locking protection refers to a type of protection that locks the faulty pole when it operates. Pole-locking protection will operate when a ground fault or pole fault occurs in the valve area. Valve-locking protection refers to a type of protection that locks the faulty valve group when it operates. Valve-locking protection will operate when a valve area fault occurs.

[0074] The voltage operation mode parameters include full-voltage operation mode and half-voltage operation mode. Full-voltage operation mode means that both the high-end valve group and the low-end valve group in a pole are in operation. At this time, the DC line voltage is maintained at 95%-105% of the rated value. For example, if both the high-end valve group and the low-end valve group of pole 1 are in operation, then pole 1 is in full-voltage operation mode. Half-voltage operation mode means that only one valve group in a pole is in operation. At this time, the DC line voltage is maintained at 45%-55% of the rated value. For example, if the high-end valve group of pole 1 is in operation and the low-end valve group of pole 1 is in a locked state, then pole 1 is in half-voltage operation mode.

[0075] Step 202: Based on the dynamic combination of the operating status parameter set, determine the fault level through a preset fault level judgment logic. The fault level includes at least: Level 1 fault, i.e., protection action triggered under abnormal communication conditions; Level 2 fault, i.e., electrode layer protection action triggered under normal communication conditions; and Level 3 fault, i.e., valve side protection action triggered under normal communication conditions.

[0076] The fault level determination logic specifically includes:

[0077] When an abnormality in inter-station communication is detected, and there is a protection action signal of polar interlock or valve interlock, it is determined to be a first-level fault.

[0078] When normal inter-station communication is detected and there is a signal of protection action of polar blocking type, it is judged as a second level fault;

[0079] When inter-station communication is detected to be normal, and only valve lockout protection action signals exist, the following classifications are made based on the voltage operation mode parameters:

[0080] Level 3 Fault Class A: Valve layer fault under full pressure operation mode;

[0081] Level 3 fault type B: Valve layer fault in semi-pressure operation mode.

[0082] Step 203: Generate a differentiated control instruction set based on the fault level. The control instruction set includes: a fault element blocking strategy for the receiving-end converter station 40, a bypass switch (BPS) operation strategy, and a coordinated response strategy for the sending-end converter station 20. Specifically, the coordinated response strategy of the sending-end converter station 20 refers to the sending-end converter station 20 dynamically adjusting at least one of the following parameters based on the fault level of the receiving-end converter station 40: DC voltage reference value, power transmission rate, frequency modulation depth, and reactive power compensation amount.

[0083] The differentiated control instruction set specifically includes:

[0084] For Level 1 faults:

[0085] The receiving-end converter station 40 performs fault pole interlocking and bypass switch closing operations;

[0086] The sending-end converter station 20 performs corresponding pole blocking and prohibits bypass switch closing operations.

[0087] For Level 2 faults:

[0088] The receiving-end converter station 40 and the sending-end converter station 20 synchronously perform fault pole blocking operation;

[0089] Bypass switch closing operations are prohibited at both ends.

[0090] For Class A, Level 3 faults:

[0091] The receiving-end converter station 40 performs fault valve interlocking and bypass switch closing operations;

[0092] The sending-end converter station 20 performs dual-valve controlled zero-pressure operation and closes the corresponding valve bypass switch.

[0093] For Class B, Level 3 faults:

[0094] The receiving-end converter station 40 performs fault valve interlocking and bypass switch closing operations;

[0095] The sending-end converter station 20 performs the corresponding pole blocking operation and prohibits the bypass switch from closing.

[0096] Step 204: Execute the control instruction set, prioritizing the selection of operation sequences that meet the following conditions:

[0097] a. Principle of minimizing fault clearing time

[0098] b. Principle of maximizing conveying capacity

[0099] c. Priority principle for system oscillation suppression

[0100] The principle of minimizing fault clearing time is achieved through the following methods:

[0101] Establish a database of control command execution delays to record the delay characteristics of each operation combination; when multiple feasible operation sequences are detected, automatically select the sequence with a total delay less than a preset threshold (recommended value: ≤80ms).

[0102] Accordingly, embodiments of the present invention also provide a fault handling device for the receiving end of a power transmission system. Please refer to [link to relevant documentation]. Figure 3 , Figure 3 This diagram illustrates the structure of a power transmission system receiving-end fault handling device according to an embodiment of the present invention. The power transmission system receiving-end fault handling device provided in this embodiment is applied to an ultra-high voltage direct current (UHVDC) transmission system. The device includes:

[0103] The operating status parameter set monitoring module 301 is used to monitor the operating status parameter set of the receiving-end converter station in real time.

[0104] The fault level determination module 302 is used to determine the fault level based on the dynamic combination of the set of operating status parameters and through preset fault level determination logic.

[0105] The control instruction set generation module 303 is used to generate a differentiated control instruction set according to the fault level;

[0106] The control instruction set execution module 304 is used to execute the control instruction set.

[0107] Accordingly, embodiments of the present invention also provide an electronic device, please refer to [link / reference]. Figure 4 , Figure 4 A structural diagram of an electronic device according to an embodiment of the present invention is shown. The electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the above-described method for handling faults at the receiving end of a power transmission system. Since the method for handling faults at the receiving end of a power transmission system has been described in detail above, it will not be repeated here.

[0108] In practical applications, the aforementioned processor includes a Field-Programmable Gate Array (FPGA), and the processor can be a Central Processing Unit (CPU) or a Digital Signal Processor (DSP). It is understood that for different devices, the electronic devices used to implement the functions of the aforementioned processor can also be other types, and this embodiment of the invention does not impose specific limitations.

[0109] The aforementioned memory can be volatile memory, such as random-access memory (RAM); or non-volatile memory, such as read-only memory (ROM), flash memory, hard disk drive (HDD), or solid-state drive (SSD); or a combination of the above types of memory, and provides instructions and data to the processor.

[0110] Accordingly, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon. This computer-readable storage medium can be applied to any method in the embodiments of the present invention, and the computer program causes a computer to execute the corresponding processes implemented by a processor in the various methods of the embodiments of the present invention. Since the method for handling faults at the receiving end of a power transmission system has been described in detail above, it will not be repeated here.

[0111] In the several embodiments provided by this invention, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components can be combined, or integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be electrical, mechanical, or other forms.

[0112] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present invention can be implemented using various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0113] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0114] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0115] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0116] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0117] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for handling receiving-end faults in a power transmission system, characterized in that: include, Obtain the set of operating status parameters for the receiving-end converter station; The fault level is determined based on the set of operating status parameters; The control instruction set is obtained based on the fault level; Execute the set of control instructions.

2. The method as described in claim 1, characterized in that: Acquire the set of operating status parameters of the receiving-end converter station, including the inter-station communication status, pole interlocking protection action signals, valve interlocking protection action signals, and voltage operating mode parameters, wherein the voltage operating mode parameters include full-voltage operating mode and half-voltage operating mode.

3. The method as described in claim 2, characterized in that: The voltage operation mode parameters include full-voltage operation mode and half-voltage operation mode, including, When the DC line voltage is maintained at 95%-105% of the rated value, it is considered to be in full-voltage operation mode; When the DC line voltage is maintained at 45%-55% of the rated value, it is considered to be in half-voltage operation mode.

4. The method as described in claim 2, characterized in that: Based on the set of operating status parameters, the fault level is determined, including: When there is abnormal inter-station communication, or when there is a signal of protection action of pole interlock or valve interlock, it is judged as a first-level fault; When inter-station communication is normal and only the polar blocking type protection action signal exists, it is judged as a level two fault; When inter-station communication is normal, only valve lockout protection action signals exist, and the system is operating in full-pressure mode, it is determined to be a Class A Level 3 fault. When inter-station communication is normal, only valve lockout protection action signals exist, and the system is operating in semi-pressure mode, it is determined to be a Class B Level 3 fault.

5. The method as described in claim 1, characterized in that: The control instruction set is obtained based on the fault level, including: The control instruction set includes fault component blocking strategy, bypass switch operation strategy, and coordinated response strategy of sending-end converter station.

6. The method as described in claim 5, characterized in that: The coordinated response strategy of the sending-end converter station includes, The sending-end converter station dynamically adjusts at least one of the following based on the receiving-end fault level: DC voltage reference value, power transmission rate, frequency modulation depth, and reactive power compensation amount.

7. The method as described in claim 1, characterized in that: Executing the control instruction set includes, When the control instruction set contains multiple feasible operation sequences, the operation sequence to be executed is determined based on the principles of shortest fault clearing time, maximum transmission capacity, and priority of system oscillation suppression.

8. The method as described in claim 7, characterized in that: The operation sequence is determined based on the principle of minimizing fault clearing time, including: Construct a database of control command execution delays to record the delay characteristics of each operation combination; For multiple feasible operation sequences, the sequence with a total delay less than a preset threshold is selected as the operation sequence.

9. A fault handling device for the receiving end of a power transmission system, characterized in that: include, The operating status parameter set monitoring module is configured to acquire the operating status parameter set of the receiving-end converter station; The fault level determination module is configured to determine the fault level based on the set of operating status parameters; The control instruction set generation module is configured to generate a control instruction set based on the fault level; and, The control instruction set execution module is configured to execute the control instruction set.

10. The apparatus as claimed in claim 9, characterized in that: The operating status parameter set monitoring module acquires the operating status parameter set of the receiving-end converter station, including the inter-station communication status, pole interlocking protection action signals, valve interlocking protection action signals, and voltage operating mode parameters. Among them, the voltage operating mode parameters include full-voltage operating mode and half-voltage operating mode.

11. The apparatus as claimed in claim 10, characterized in that: The voltage operation mode parameters include full-voltage operation mode and half-voltage operation mode, including, When the DC line voltage is maintained at 95%-105% of the rated value, it is considered to be in full-voltage operation mode; When the DC line voltage is maintained at 45%-55% of the rated value, it is considered to be in half-voltage operation mode.

12. The apparatus as claimed in claim 10, characterized in that: The fault level determination module determines the fault level based on the set of operating status parameters, including: When there is abnormal inter-station communication, or when there is a signal of protection action of pole interlock or valve interlock, it is judged as a first-level fault; When inter-station communication is normal and only the polar blocking type protection action signal exists, it is judged as a level two fault; When inter-station communication is normal, only valve lockout protection action signals exist, and the system is operating in full-pressure mode, it is determined to be a Class A Level 3 fault. When inter-station communication is normal, only valve lockout protection action signals exist, and the system is operating in semi-pressure mode, it is determined to be a Class B Level 3 fault.

13. The apparatus as claimed in claim 9, characterized in that: The control instruction set generation module generates a control instruction set based on the fault level, including: The control instruction set includes fault component blocking strategy, bypass switch operation strategy, and coordinated response strategy of sending-end converter station.

14. The apparatus as claimed in claim 13, characterized in that: The coordinated response strategy of the sending-end converter station includes, The sending-end converter station dynamically adjusts at least one of the following based on the receiving-end fault level: DC voltage reference value, power transmission rate, frequency modulation depth, and reactive power compensation amount.

15. The apparatus as claimed in claim 9, characterized in that: The control instruction set execution module executes the control instruction set, including, When the control instruction set contains multiple feasible operation sequences, the operation sequence to be executed is determined based on the principles of shortest fault clearing time, maximum transmission capacity, and priority of system oscillation suppression.

16. The apparatus as claimed in claim 15, characterized in that: The operation sequence is determined based on the principle of minimizing fault clearing time, including: Construct a database of control command execution delays to record the delay characteristics of each operation combination; For multiple feasible operation sequences, the sequence with a total delay less than a preset threshold is selected as the operation sequence.

17. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor; characterized in that: When the processor executes the computer program, it implements the steps of the power transmission system receiving-end fault handling method as described in any one of claims 1 to 8.

18. A computer-readable storage medium storing a computer program; characterized in that: When the computer program is executed by the processor, it implements the steps of the power transmission system receiving-end fault handling method as described in any one of claims 1 to 8.

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